Visa

How to get a Myanmar visa
Getting a Myanmar visa is easier than before but requirements change on a regular basis and it is advisable to check with the Myanmar embassy in your country. A tourist visa’s validity expires 90 days after issue and only allows a 28-day, single-entry visit. 
Read more: http://www.lonelyplanet.com/myanmar-burma/practical-information/visas#ixzz2goMKxpc8
One easy way to get Myanmar visa is to use visa online services. Here are some of them:
http://www.myanmarvisa.com/ 
http://www.myanmarvisaonline.com 

Getting a Myanmar Visa in Bangkok
It's very easy.  The process is quick and simple. Go to Myanmar embassy at this address-
        Address : 132, Sathorn Nua Road,
        BANGKOK 10500
        (662) 234-4698, 233-7250, 234-0320,  637-9406  
The nearst BTS station is Surasak. The embassy opens at 9 a.m.

You Need
1. Cash: 1200 Baht (same day). 1000 Baht (next day). 810 Baht (two days)
2. Two passport-sized photos.
3. Copy of your passport. (Please don't forget to bring your passport along)

You may want to here other people's experiences getting a Myanmar visa in Bangkok. Here are some links:
My experience getting a Myanmar visa in Bangkok
How to Get a Myanmar (Burma) Visa in Bangkok